The following conditions are relatively common with regards to tagging (and exclusion of these conditions in the software, a possible cause) :

tags can contain more than one word

tags can overlap resulting in words that are associated with more than one tag

Visually, this might look like this:

Ridiculous! But it helps to demonstrate the following issue. Using the above (absurb) script segment , lets say that the GREEN items are tagged as physical props and the BLUE items (scentence) represents a VFX sequence of shots. This means that: